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US 7,094,736 B2Granted
Sampling of hydrocarbons from geological formations
AssigneeSchlumberger Technology Corporation
InventorsTimothy Gareth John Jones, Gary John Tustin
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AssigneeSchlumberger Technology Corporation
InventorsTimothy Gareth John Jones, Gary John Tustin
Estimating the term…
A method of separating from a mixture of oil-based drilling fluid and sample of formation hydrocarbon, the liquid component of the drilling fluid, which method comprises treating, e.g. chemically, the mixture in a way that selectively substantially affects the liquid component of the drilling fluid, producing one or more treatment products, while leaving the formation hydrocarbon substantially unaffected; and separating the treatment products from the formation hydrocarbon, by solvent extraction. The liquid component of the drilling fluid conveniently comprises one or more esters (which do not occur in significant quantities in naturally occuring formation hydrocarbons) and which can be hydrolysed to give water-soluble products readily removable from the formation hydrocarbon. The invention is applicable to sampling of formation hydrocarbon using wireline formation testers or sampling tools.
A method of separating from a mixture of oil-based drilling fluid and a sample of formation hydrocarbon, the liquid component of the drilling fluid, which method comprises chemically treating the mixture in a way that selectively substantially affects the liquid component of the drilling fluid, producing one or more treatment products, while leaving the formation hydrocarbon substantially unaffected;
A method according to any one of the preceding claims, wherein the liquid component of the drilling fluid comprises one or more esters.
A method according to any one of the preceding claims, wherein the liquid component of the drilling fluid comprises poly(alphaolefins).
A method according to anyone of the preceding claims, wherein the separation step uses a physical separation technique.
A method of recovering a sample of hydrocarbon from a formation, comprising drilling a bore hole into the formation using an oil-based drilling fluid;
Dependencies are inferred from the claim text.